Steam-balanced slide-valve.



BARNGROVER. STEAM BALANCED SLIDE VALVE. APPLICATION IILBD JUNE 29, 1908.

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FBANKBARNGROVER, OF NEWTON, IOWA.

STEAM-BALANCED SLIDE-VALVE.

Specification of Letters Patent.

Patented Dec. 22, 1908 Application filed June 29, 1908. Serial N 0. 440,934.

To all whom it may concern:

Be it known that I, FRANK BARNGROVER, citizen of the United States, residing at Newton, in the county of Jasper and State of Iowa, have invented certain new and useful Improvements in Steam-Balanced SlideValves, of which the following is a specification.

The present invention provides a valve which is practically balanced, possessed of ample port-ways for the free passage of steam or other motive medium, close fitting to prevent waste of the motive medium, selfrelieving to prevent an abnormal or excessive pressure in the cylinder and which is effective, positive and reliable in operation.

For a full understanding of the invention and the merits thereof and also to acquire a knowledge of the details of construction and the means for effecting the result, reference is to be had to the following description and accompanying drawings.

While the invention may be adapted to different forms and conditions by changes in the structure and minor details without departing from the spirit or essential features thereof, still the preferred embodiment is shown in the accompanying drawings, in which:

Figure 1 is a longitudinal section on the line acm of Fig. 2, of a balanced valve embodying the invention, an end portion of the valve being in full lines. Fig. 2 is a cross section on the line y y of Fig. 1. Fig. 3 is a perspective view of the valve cover as seen from the inner side. Fig. 4 is a perspective view of the valve proper, showing the packing,.the latter being elevated. Fig. 5 is a sectional view of the portion of the valve rod connected to the valve. Fig. 6 is a transverse section of the valve and packing.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The cylinder 1 is provided at oneside with the usual ports 2 and 3,the ports 2 establishingcommunication between opposite ends of the cylinder and the chest 4, and the port 3 ,providing an escape for the motive medlum after its energy has been expended.

The chest 4 covers the ports 2 and 3 and is ada )ted to receive steam or other motive me ium from a suitable source in any accustomed way. Aplate 5 is fitted upon the port-face of the cylinder and packing 6 is interposed between said plate and the part upon which it is seated to insure the formation of a tight joint. A cover 7 of arch form is fitted upon the plate 5 and held in place by means of set screws 8 threaded into the outer wall of thechest 4. To prevent slipping of the plate 5 it is provided with lugs 9 which enter opposite ends of the exhaust port and fit the same in a manner to prevent possible movement of the plate 5. The valve cover 7 is prevented from slipping by dowels extended from the plate and entering openings 10 formed near the corners of said cover. The valve cover is of arch form and is provided upon its inner wall with a series of channels 11 and 12, the latter occupying a central position and the channels 11 being at the sides of the middle channel and near the ends of the valve.

The several channels decrease in depth from their ends towards a middle point, whereby a maximum amount of space is provided at their extremities. The middle channel 12 is approximately twice the width of the channels 11, thereby providing an escape for the spent motive medium with as little resistance as possible. The channel 12 is in communication with the exhaust port 3 and the channels 11 are in communication with the live steam ports 2. An opening leads outward from each channel 11 near the lower side of the valve cover and each opening is lined with a tube 13 of brass or like metal, the end of the tube projecting slightly to form a seat against which a valve 14 is adapted to close, said valve being pivoted or hinged at 15 to the valve cover and closing by gravity supplemented by the action ofthe live steam in the chest which exerts a superior force upon the outer side of the valve to hold it to its seat. The valve controlled openings afford relief for any abnormal or excessive pressure in the cylinder, as when priming .theengine or by any ac cumulation of water, the latter finding a ready exit through the tubes 13 and valves 14.

The valve proper consists of a body por- 'inner and outer corners of each head 17 are beveled, as indicated at 18 to provide for admission of the steam through the ports 11, while at the same time providing for a minimum amount of movement or throw of the valve. The outer straight corners of the valve are beveled, as indicated at 19, for a like purpose. A port 20 is formed in each end of each head 17. A recess 21 is formed in the curved side of each head and is covered by means of a packing 22 which fits in a groove or depression formed in the curved side of each head 17. Each packing 22 is of metal and is of such formation as to snugly fit the space formed in the curved side of the head 17 by the groove or channel formed therein. A slot 23 is formed in the end portion of each packing 22 and registers with the ports 20 formed in the end portions of the head. The slots 23 provide ports for the direct admission of steam into the depression 21 so as to equalize the pressure of the steam upon opposite sides of the packing 22, as well as upon opposite sides of the valve, with the result that the valve is practically balanced. Moreover, the addition of steam betweenthe packing 22 and the head 17 provides for forcing said parts outward or away from each other with the result that a close joint is maintained between the valve and the plate 5 and between the packing 22 and the valve cover so that escape or waste of motive medium is prevented.

The valve rod 24 has an end portion passed through an opening 25 formed through the valve, said opening being of largerdiameter than the portion of the valve rod fitting therein, whereby provision is had for adjustment of the parts to prevent binding of the valve rod in the gland of the chest, or the binding of the valve upon its seat or cover. The valve rod has a section 26 which is formed with an opening in one end interiorly threaded to receive an externally threaded reduced end portion 27 of the valve rod 24. A clamp nut 28 is mounted upon the reduced threaded end portion 27 of the valve rod and obtains a bearing against one end of the valve. A nut 29 is mounted upon the reduced end 30 of the valve rod section 26 and is adapted to engage with the opposite end of the valve. A set nut 31 mounted upon the reduced end 30 of the part 26, fixes the position of the nut 29. When the parts are in place the outer flanges of the nuts 28 and 29 engage with opposite ends of the valve and close the ends of the opening 25.

The peculiar arrangement of the several parts admits of adjusting the valve with reference to the valve rod, whereby the desired lead or cut-off may be obtained.

Having thus described the invention, what is claimed as new is:

1. In combination, a cylinder provided with the usual exhaust and live ports, and a chest covering the same, a plate fitted to the port-face of the cylinder and having lugs entering the exhaust port to prevent displacement of the plate, a valve cover, interlocking means between the valve cover and plate, 'set screws threaded into the chest to hold the valve cover and plate in position, and a valve operating in the space inclosed by the said plate and cover.

2. In a balanced valve, the combination of a valve having a depression in its outer side, and a port in communication with said depression, a packing seated upon the valve and covering the depression formed therein and having an opening in communication with the depression and the port of the valve, and a cover for said valve having a channel formed therein and adapted to communicate with a live port of the cylinder.

3. In a balanced valve, the combination of a valve proper having a depression in a side and terminal ports leading from said depression, a packing seated upon the valve and covering the said depression and having an opening near each end in communication with the depression and in register with the ports of the valve, a cover having a channel through which the live steam is adapted to pass.

4. In a balanced slide valve, the combination of a valve proper having its middle portion contracted and its end portions provided with ports, and a valve cover having a middle and end channels, the middle channel being of greater width than the end channels and the several channels deepening from a middle point towards their ends.

5. In a balanced slide valve, the combination of a valve having its middle portion contracted and its end portions enlarged and provided with ports and having the corners of the end portions beveled to provide clearance, and a cover having a middle channel and other channels at the sides of the middle channel, the middle and side channels adapted to register with the exhaust and live steam ports of the engine.

6. In combination, a valve having an opening therethrough, a rod having an end portion reduced, a section threaded upon the reduced end of the rod and in turn having its opposite end reduced and threaded, nuts threaded upon the reduced ends of, respec tively, the said rod and section, and a set nut threaded upon the reduced end of the said section to fix the position of the outer leading outward from the lower portions of 0 nut mounted thereon. the side channels, and Valves controlling said 7 In combination, a cylinder having the openings. usual exhaust and live ports, a valve, a In testimony whereof I affix my signature cover for the valve having a middle channel, in presence of two witnesses.

and other channels at the sides of the middle FRANK BARNGROVER. [L. s.] channel, the middle and side channels regis- Witnesses: tering with the said exhaust and live ports, V. B. HILLYARD,

respectively, said cover having openings KN. YVoonson. 

